Luminaire

Abstract

A luminaire includes a housing, a heat sink, and a light assembly. The housing includes a pair of elongated, parallel legs and a cross-member extending between the legs. The cross-member defines a first surface and a second surface opposite the first surface, and the first surface includes an opening. The heat sink is coupled to the housing proximate the second surface of the cross-member. The heat sink is positioned between the legs and the heat sink includes a plate and a fin array. The plate defines a first surface and a second surface opposite the first surface, and the fin array including a plurality of fins protruding from the first surface. The light assembly is coupled to the second surface of the heat sink and includes at least one light-emitting element (e.g., a light-emitting diode or LED).

The invention claimed is: 
     
       1. A luminaire comprising:
 a housing including a pair of elongated, parallel legs and a cross-member extending between the legs, the cross-member defining a first surface and a second surface spaced apart from the first surface, the first surface including an opening, each leg including an inner surface and a lower extent and at least one groove extending between the inner surface and the lower extent; 
 a heat sink coupled to the housing and positioned proximate the second surface of the cross-member, the heat sink positioned between the inner surface of the legs, the heat sink including a plate and a fin array, the plate defining a first surface and a second surface opposite the first surface, the fin array including a plurality of fins protruding from the first surface, and the fin array defining at least one air flow channel having an inlet and an outlet; and 
 a light assembly coupled to the second surface of the heat sink, the light assembly including at least one light-emitting element, 
 wherein the groove directs air flow from below the housing toward the at least one air flow channel, and 
 wherein each leg includes an outer surface facing away from the other leg, at least one of the outer surfaces includes an opening to permit access to an internal compartment of the housing. 
 
     
     
       2. The luminaire of  claim 1 , wherein the light assembly includes a circuit board and a lens, the circuit board coupled to the second surface of the heat sink, the light-emitting element including a light-emitting diode, the lens coupled to the second surface of the heat sink independent of the circuit board. 
     
     
       3. The luminaire of  claim 1 , wherein the housing includes an axis extending between the first surface and the second surface, the axis positioned in a substantially vertical orientation, the cross-member extending in a direction perpendicular to the first axis. 
     
     
       4. The luminaire of  claim 1 , wherein the housing further includes a cover removably coupled to the one of the outer surfaces to selectively close the opening. 
     
     
       5. The luminaire of  claim 1 , wherein the heat sink includes at least one post extending away from the first surface, the housing further including at least one fastener extending from the housing to engage the post and removably couple the heat sink to the housing. 
     
     
       6. The luminaire of  claim 1 , further comprising a controller and a conduit in electrical communication with the controller, wherein the heat sink includes a hole extending through the plate, the conduit extending through the hole of the heat sink to provide electrical communication between the controller and the circuit board. 
     
     
       7. The luminaire of  claim 1 , wherein the cross-member includes a main body and a support bracket removably coupled to the main body, the first surface formed on the main body and the second surface formed on the support bracket, wherein the heat sink is removably coupled to the support bracket. 
     
     
       8. The luminaire of  claim 7 , wherein the housing further includes a seal positioned between the main body and the support bracket to thermally insulate the main body from the support bracket. 
     
     
       9. The luminaire of  claim 7 , wherein the support bracket includes a hole, wherein a conduit passes through the bracket hole such that the conduit is thermally insulated relative to the support bracket. 
     
     
       10. A luminaire comprising:
 a housing including a pair of elongated, parallel legs and a cross-member extending between the legs, the cross-member defining a first surface and a second surface spaced apart from the first surface, the first surface including an opening, each leg including an inner surface and a lower extent and at least one groove extending between the inner surface and the lower extent; 
 a heat sink coupled to the housing and positioned proximate the second surface of the cross-member, the heat sink positioned between the inner surface of the legs, the heat sink including a plate and a fin array, the plate defining a first surface and a second surface opposite the first surface, the fin array including a plurality of fins protruding from the first surface, and the fin array defining at least one air flow channel having an inlet and an outlet; and 
 a light assembly coupled to the second surface of the heat sink, the light assembly including at least one light-emitting element, 
 wherein the groove directs air flow from below the housing toward the at least one air flow channel, and 
 wherein the fin array defines at least one air flow channel extending from a first edge of the heat sink to a first end of the heat sink, wherein air flow is directed from the first edge of the heat sink and toward the first end of the heat sink. 
 
     
     
       11. The luminaire of  claim 10 , wherein each groove includes an angled surface extending between the lower extent and the inner surface for directing the air flow from below the housing into the at least one air flow channel. 
     
     
       12. The luminaire of  claim 10 , wherein the air flow exits the air flow channel at a location below the first surface of the cross-member. 
     
     
       13. The luminaire of  claim 10 , wherein the light assembly includes a circuit board and a lens, the circuit board coupled to the second surface of the heat sink, the light-emitting element including a light-emitting diode, the lens coupled to the second surface of the heat sink independent of the circuit board. 
     
     
       14. The luminaire of  claim 10 , wherein the housing includes an axis extending between the first surface and the second surface of the cross-member, the axis positioned in a substantially vertical orientation, the cross-member extending in a direction perpendicular to the first axis. 
     
     
       15. The luminaire of  claim 10 , wherein each leg includes an outer surface facing away from the other leg, and wherein at least one of the outer surfaces includes an opening to permit access to an internal compartment of the housing. 
     
     
       16. The luminaire of  claim 15 , wherein the housing further includes a cover removably coupled to the one of the outer surfaces to selectively close the opening. 
     
     
       17. The luminaire of  claim 10 , wherein the heat sink includes at least one post extending away from the first surface of the heat sink, the housing further including at least one fastener extending from the housing to engage the post and removably couple the heat sink to the housing. 
     
     
       18. The luminaire of  claim 10 , further comprising a controller and a conduit in electrical communication with the controller, wherein the heat sink includes a hole extending through the plate, the conduit extending through the hole of the heat sink to provide electrical communication between the controller and the circuit board. 
     
     
       19. The luminaire of  claim 10 , wherein the cross-member includes a main body and a support bracket removably coupled to the main body, the first surface of the cross-member formed on the main body and the second surface formed on the support bracket, wherein the heat sink is removably coupled to the support bracket. 
     
     
       20. The luminaire of  claim 19 , wherein the housing further includes a seal positioned between the main body and the support bracket to thermally insulate the main body from the support bracket. 
     
     
       21. The luminaire of  claim 19 , wherein the support bracket includes a hole, wherein a conduit passes through the bracket hole such that the conduit is thermally insulated relative to the support bracket. 
     
     
       22. A luminaire comprising:
 a housing including a first portion and a second portion, the first portion having a first surface and a second surface spaced apart from the first surface, the first portion defining a first axis extending between the first surface and the second surface, the first surface including an opening configured to receive an electrical conduit in electrical communication with a power source, the first surface defining an uppermost portion of the housing; 
 a heat sink supported by the housing and positioned proximate the second surface, the heat sink including a plate and a fin array protruding from a surface of the plate, the plate having a first end, a second end, a first edge extending between the first end and the second end, and a second edge extending between the first end and the second end, the fin array defining at least one air flow channel having an inlet positioned proximate the first edge of the plate and an outlet positioned proximate one of the first end and the second end of the plate; 
 a light assembly including at least one light-emitting element and a lens, the light assembly coupled to a surface of the plate opposite the fin array, 
 wherein the first portion of the housing includes a first side wall and a second side wall, the first side wall and the second side wall extending between the first surface and the second surface, 
 wherein the heat sink defines a heat sink axis extending between the first end of the plate and the second end of the plate, and 
 wherein the first end of the heat sink extends beyond the first side wall of the housing and the second end of the heat sink plate extends beyond the second side wall of the housing. 
 
     
     
       23. The luminaire of  claim 22 , wherein the housing further includes an elongated second portion connected to the first portion, the elongated portion oriented parallel to the heat sink axis and offset from the first axis, the second portion including a first end and a second end, the first end extending beyond the first side wall of the first portion, the second end extending beyond the second side wall of the first portion, the second portion further including a lower extent positioned below the second surface of the first portion. 
     
     
       24. The luminaire of  claim 23 , wherein the second portion includes an inner surface facing toward the heat sink, the second portion including at least one groove extending between the inner surface and the lower extent, the groove directing air flow from below the housing toward the at least one air flow channel. 
     
     
       25. The luminaire of  claim 24 , wherein the air flow is directed from the first side of the heat sink, past the at least one fin, and toward one of the first end and the second end of the heat sink, the air flow exiting the air flow channel at a location below the first surface of the first portion. 
     
     
       26. The luminaire of  claim 22 , wherein the fin array includes at least one fin having a first portion adjacent the first end of the plate and a second portion adjacent the first side of the plate, the second portion of the fin forming an angle relative to the first portion. 
     
     
       27. The luminaire of  claim 22 , wherein the first portion of the housing defines a main body and the second surface includes a support bracket removably coupled to the main body, wherein the heat sink is removably coupled to the support bracket. 
     
     
       28. The luminaire of  claim 27 , wherein the housing further includes a seal positioned between the main body and the support bracket to thermally insulate the main body from the support bracket. 
     
     
       29. The luminaire of  claim 22 , wherein the heat sink includes a hole extending through the plate, the luminaire further comprising a conduit passing through the hole and providing electrical communication with the circuit board.